Alright, let's solve this math problem step by step. First, we have the number 255. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 42. So, we're going to take the number 255 and add it to itself 42 times.
Step 1: 0 + 255 = 255
Step 2: 255 + 255 = 510
Step 3: 510 + 255 = 765
Step 4: 765 + 255 = 1020
Step 5: 1020 + 255 = 1275
Step 6: 1275 + 255 = 1530
Step 7: 1530 + 255 = 1785
Step 8: 1785 + 255 = 2040
Step 9: 2040 + 255 = 2295
Step 10: 2295 + 255 = 2550
Step 11: 2550 + 255 = 2805
Step 12: 2805 + 255 = 3060
Step 13: 3060 + 255 = 3315
Step 14: 3315 + 255 = 3570
Step 15: 3570 + 255 = 3825
Step 16: 3825 + 255 = 4080
Step 17: 4080 + 255 = 4335
Step 18: 4335 + 255 = 4590
Step 19: 4590 + 255 = 4845
Step 20: 4845 + 255 = 5100
Step 21: 5100 + 255 = 5355
Step 22: 5355 + 255 = 5610
Step 23: 5610 + 255 = 5865
Step 24: 5865 + 255 = 6120
Step 25: 6120 + 255 = 6375
Step 26: 6375 + 255 = 6630
Step 27: 6630 + 255 = 6885
Step 28: 6885 + 255 = 7140
Step 29: 7140 + 255 = 7395
Step 30: 7395 + 255 = 7650
Step 31: 7650 + 255 = 7905
Step 32: 7905 + 255 = 8160
Step 33: 8160 + 255 = 8415
Step 34: 8415 + 255 = 8670
Step 35: 8670 + 255 = 8925
Step 36: 8925 + 255 = 9180
Step 37: 9180 + 255 = 9435
Step 38: 9435 + 255 = 9690
Step 39: 9690 + 255 = 9945
Step 40: 9945 + 255 = 10200
Step 41: 10200 + 255 = 10455
Step 42: 10455 + 255 = 10710

So, 255*42 = 10710